| (19) |
 |
|
(11) |
EP 0 849 727 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.08.1998 Bulletin 1998/35 |
| (43) |
Date of publication A2: |
|
24.06.1998 Bulletin 1998/26 |
| (22) |
Date of filing: 17.12.1997 |
|
| (51) |
International Patent Classification (IPC)6: G11B 7/24 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
18.12.1996 JP 338199/96
20.01.1997 JP 7355/97
|
| (71) |
Applicant: Mitsubishi Chemical Corporation |
|
Chiyoda-ku
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Suzuki, Yuki,
Mitsubishi Chemical Corporation
Aoba-ku,
Yokohama,
Kanagawa (JP)
- Okamoto, Yuuko,
Mitsubishi Chemical Corporation
Aoba-ku,
Yokohama,
Kanagawa (JP)
- Horie, Michikazu,
Mitsubishi Chemical Corporation
Aoba-ku,
Yokohama,
Kanagawa (JP)
- Kurose, Yutaka,
Mitsubishi Chemical Corporation
Aoba-ku,
Yokohama,
Kanagawa (JP)
- Maeda, Shuuichi,
Mitsubishi Chemical Corporation
Aoba-ku,
Yokohama,
Kanagawa (JP)
|
| (74) |
Representative: Pätzold, Herbert, Dr.-Ing. |
|
Steubstrasse 10
82166 Gräfelfing
82166 Gräfelfing (DE) |
|
| |
|
| (54) |
Optical recording disk |
(57) A high-density optical disk comprises a transparent substrate having a guide groove
having a depth of 100 to 200nm, width of 0.2 to 0.4µm arranged with a track pitch
of 0.7 to 1.0µm. A recording layer is made of an organic pigment exhibiting a specific
main weight reduction in a thermogravimetric analysis and a specific exothermic peak
in a differential thermal analysis.